JP6541405B2 - Zoom lens and imaging device having the same - Google Patents

Description

  The present invention relates to a zoom lens and an image pickup apparatus having the same, such as an image pickup apparatus using an image pickup element such as a video camera, an electronic still camera, a broadcast camera, a surveillance camera, etc. It is suitable for the device.

  A zoom lens having a high zoom ratio and high optical performance is required for an imaging optical system used in an imaging apparatus. Generally, a zoom lens with a high zoom ratio tends to be large in size as well as heavy. When the zoom lens is large and heavy, the zoom lens often vibrates due to camera shake or the like at the time of photographing. When the zoom lens tilts due to vibration, the photographed image (imaging position) shifts (image blur) by an amount corresponding to the tilt angle and the focal length at the zoom position at that time. That is, image blurring occurs.

  A zoom lens in which a part of the lens system is shifted in a direction perpendicular to the optical axis is known as a means (a means having an anti-vibration function) for correcting the image blurring at this time (Patent Documents 1 and 2) . In Patent Document 1, image blur correction is performed by shifting the third lens group in the four-unit zoom lens configured of the first to fourth lens groups having positive, negative, positive, and positive refractive power in order from the object side It is carried out. In Patent Document 2, the fourth lens group is shifted in order from the object side to the image side in the five-group zoom consisting of the first to fifth lens groups of positive, negative, positive, negative and positive refractive power, Shake correction is performed.

  In addition, in order to reduce decentering aberrations that occur when correcting image blurring (during image stabilization), some lens units of the lens system are shifted in the direction perpendicular to the optical axis and one point on the optical axis is There is known a zoom lens rotated at a minute angle as a rotation center (Patent Document 3). In the patent document 3, the second lens group is shifted and tilted in a four-unit zoom lens composed of first to fourth lens groups of positive, negative, positive and positive refractive power in order from the object side to the image side Image stabilization is performed.

  In addition, a zoom lens is known in which a plurality of lens groups of a lens system are shifted in a direction perpendicular to the optical axis to reduce the occurrence of decentering aberration when correcting image blurring (during image stabilization). (Patent Document 4). In Patent Document 4, the second lens group and the fourth lens group are arranged in order from the object side to the image side in a five-group zoom lens consisting of a first lens group having a positive, negative, positive, negative, positive refractive power first to fifth lens groups. Alternatively, the anti-vibration function is shared by the plurality of lens units of the third lens unit and the fifth lens unit.

  In addition, in order to reduce the occurrence of decentering aberrations when correcting image blurring (during image stabilization), some lens groups of the lens system are shifted in a direction perpendicular to the optical axis, and another lens group is There is known a zoom lens which is rotated about a point on the optical axis (Patent Document 5). In Patent Document 5, in the five-unit zoom lens consisting of the first to fifth lens units having positive, negative, positive, negative, and positive refractive powers in order from the object side to the image side, image stabilization is achieved by the shift of the fourth lens unit. While obtaining the function, the eccentric aberration is corrected by the rotation of the second lens unit. In Patent Document 5, in the five-unit zoom lens consisting of lens units of positive, negative, positive, negative, and positive refractive power in order from the object side to the image side, the second lens unit is shifted to obtain an anti-vibration function. Eccentric aberration is corrected by rotation of a part of lenses in the third lens group.

Japanese Patent Application Laid-Open No. 10-260356 Japanese Patent Application Laid-Open No. 10-090601 Unexamined-Japanese-Patent No. 05-232410 JP 2001-249276 A Unexamined-Japanese-Patent No. 2003-202499

  In general, in a zoom lens having a vibration reduction function, in order to perform image blur correction with high precision and to reduce aberration fluctuation generated at the time of image blur correction, the lens configuration of the zoom lens and the vibration reduction lens for image blur correction It is important to set the lens configuration etc. of the group appropriately. It is difficult to maintain high optical performance at the time of image stabilization if the lens configuration of the image stabilizing lens group moved for image blurring correction and the image stabilizing lens group moved for aberration correction is not appropriate.

  For example, in Patent Document 4, the shift amount of each lens group is reduced by sharing the anti-vibration function among a plurality of lens groups. This reduces the occurrence of decentration aberrations. However, as the image blur correction angle increases, more decentration aberrations occur from each lens unit. As a result, the optical performance at the time of image stabilization is degraded.

  An object of the present invention is to provide a zoom lens which is easy to perform image blur correction and can maintain good optical performance even at the time of image blur correction, and an imaging apparatus having the same.

The zoom lens according to the present invention includes a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens group having a positive refractive power, which are disposed in order from the object side to the image side It has a rear group including the above lens group, and the distance between the first lens group and the second lens group becomes wide during zooming from the wide-angle end to the telephoto end, and the second lens group and the third lens group In the zoom lens in which the distance between the adjacent lens groups changes so that the distance between the third lens group and the rear group becomes narrow,
A vibration reduction lens group A that moves so as to include a component in a direction perpendicular to the optical axis at the time of image blurring correction, and the rotation of the vibration reduction lens group A around one point on or near the optical axis Anti-vibration lens group B
The focal length of the anti-vibration lens group B is fB, the focal length of the zoom lens at the telephoto end is ft, the maximum value of the image blur correction angle at the telephoto end is θt, and the image blur correction of the image blur correction angle θt at the telephoto end Assuming that the rotation angle of the vibration reduction lens unit B at the time of image formation is TBt,
0.01 <| fB | / ft <0.35
0.85 <| TBt | / θt <10.00
It is characterized by satisfying the following conditional expression.

  According to the present invention, it is possible to obtain a zoom lens in which image blurring correction is easy and, at the time of image blurring correction, good optical performance can be maintained.

Lens cross section of Example 1 Longitudinal aberration of Example 1 Transverse aberration diagram of Example 1 Transverse aberration at the time of image blurring correction of Example 1 Lens cross section of Example 2 Longitudinal aberration of Example 2 Transverse aberration diagram of Example 2 Transverse aberration at the time of image blurring correction of Example 2 Lens cross section of Example 3 Longitudinal aberration diagram of Example 3 Transverse aberration diagram of Example 3 Transverse aberration at the time of image blurring correction of Example 3 Lens cross section of Example 4 Longitudinal aberration diagram of Example 4 Transverse aberration diagram of Example 4 Transverse aberration at the time of image blurring correction of Example 4 Lens cross section of Example 5 Longitudinal aberration diagram of Example 5 Transverse aberration diagram of Example 5 Transverse aberration at the time of image blurring correction of Example 5 An explanatory view of a turning mechanism according to the present invention Principal part schematic view of the imaging device of the present invention

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. The zoom lens according to the present invention includes a first lens group having a positive refractive power, a second lens group having a negative refractive power, and a third lens group having a positive refractive power, which are disposed in order from the object side to the image side It has a rear group including the above lens group. During zooming from the wide-angle end to the telephoto end, the distance between the first lens group and the second lens group widens, the distance between the second lens group and the third lens group narrows, and the distance between the third lens group and the rear group The distance between adjacent lens groups changes so as to spread.

  The vibration reduction lens group A moves so as to include a component in a direction perpendicular to the optical axis during image blur correction, and rotates around a point on the optical axis or in the vicinity of the optical axis as the vibration reduction lens group A moves. A vibration reduction lens unit B is provided.

  FIGS. 1A, 1B, and 1C are lens cross-sectional views at the wide-angle end, at an intermediate zoom position, and at the telephoto end according to the first embodiment of the present invention. FIGS. 2A, 2B, and 2C are longitudinal aberration diagrams at the wide-angle end, at the intermediate zoom position, and at the telephoto end according to the first embodiment of the present invention. FIGS. 3A, 3B, and 3C are lateral aberration diagrams at the wide-angle end, at the middle zoom position, and at the telephoto end according to the first embodiment of the present invention. FIGS. 4A, 4B, and 4C are lateral aberration diagrams at the time of image blurring correction at the wide-angle end, at the middle zoom position, and at the telephoto end according to the first embodiment of the present invention. The first embodiment is a zoom lens having a zoom ratio of 47.49 and an aperture ratio (F number) of about 3.50 to 6.72.

  FIGS. 5A, 5B, and 5C are lens cross-sectional views at the wide-angle end, at the middle zoom position, and at the telephoto end according to the second embodiment of the present invention. FIGS. 6A, 6B, and 6C are longitudinal aberration diagrams at the wide-angle end, at the intermediate zoom position, and at the telephoto end according to the second embodiment of the present invention. FIGS. 7A, 7B, and 7C are lateral aberration diagrams at the wide-angle end, at the intermediate zoom position, and at the telephoto end according to the second embodiment of the present invention. FIGS. 8A, 8B, and 8C are lateral aberration diagrams at the time of image blur correction at the wide-angle end, at the middle zoom position, and at the telephoto end according to the second embodiment of the present invention. The second embodiment is a zoom lens having a zoom ratio of 28.93 and an aperture ratio (F number) of about 3.32 to 6.86.

  FIGS. 9A, 9B, and 9C are lens cross-sectional views of the zoom lens according to the third embodiment of the present invention at the wide-angle end, at the middle zoom position, and at the telephoto end. FIGS. 10A, 10B, and 10C are longitudinal aberration diagrams at the wide-angle end, at the intermediate zoom position, and at the telephoto end according to the third embodiment of the present invention. FIGS. 11A, 11B, and 11C are lateral aberration diagrams at the wide-angle end, at the intermediate zoom position, and at the telephoto end according to the third embodiment of the present invention. FIGS. 12A, 12B, and 12C are lateral aberration diagrams at the time of image blurring correction at the wide-angle end, at the middle zoom position, and at the telephoto end according to the third embodiment of the present invention. The third embodiment is a zoom lens having a zoom ratio of 61.52 and an aperture ratio (F number) of 3.51 to 6.82.

  FIGS. 13A, 13B, and 13C are lens cross-sectional views at the wide-angle end, at the intermediate zoom position, and at the telephoto end according to the fourth embodiment of the present invention. FIGS. 14A, 14B, and 14C are longitudinal aberration diagrams at the wide-angle end, at the intermediate zoom position, and at the telephoto end according to the fourth embodiment of the present invention. FIGS. 15A, 15B, and 15C are lateral aberration diagrams at the wide-angle end, at the intermediate zoom position, and at the telephoto end according to the fourth embodiment of the present invention. FIGS. 16A, 16B, and 16C are lateral aberration diagrams at the time of image blur correction at the wide-angle end, at the middle zoom position, and at the telephoto end according to the fourth embodiment of the present invention. The fourth embodiment is a zoom lens having a zoom ratio of 21.59 and an aperture ratio (F number) of 3.61 to 7.31.

  FIGS. 17A, 17B, and 17C are lens cross-sectional views of the zoom lens according to the fifth embodiment of the present invention at the wide-angle end, at the middle zoom position, and at the telephoto end. 18A, 18B, and 18C are longitudinal aberration diagrams at the wide-angle end, at an intermediate zoom position, and at the telephoto end according to the fifth embodiment of the present invention. FIGS. 19A, 19B, and 19C are lateral aberration diagrams at the wide-angle end, at the intermediate zoom position, and at the telephoto end according to the fifth embodiment of the present invention. FIGS. 20A, 20B, and 20C are lateral aberration diagrams at the time of image blur correction at the wide-angle end, at the middle zoom position, and at the telephoto end according to the fifth embodiment of the present invention. The fifth embodiment is a zoom lens system having a zoom ratio of 17.04 and an aperture ratio (F number) of 3.92 to 7.31.

  FIG. 21 is an explanatory view of a pivoting mechanism according to the present invention. FIG. 22 is a schematic view of the essential parts of the imaging device of the present invention.

  The zoom lens of the present invention is used in an imaging device such as a digital camera, a video camera, a silver halide film camera, and the like. In the lens sectional view, the left is the front (object side, enlargement side) and the right is the rear (image side, reduction side). In the lens sectional view, LO is a zoom lens, and LR is a rear group including one or more lens groups. i indicates the order of the lens units from the object side to the image side, and Li is the ith lens unit. SP is an F-number determining member (hereinafter also referred to as "aperture stop") that acts as an aperture stop that determines (limits) an open F-number (Fno) luminous flux.

  G is an optical block corresponding to an optical filter, a face plate, a quartz low pass filter, an infrared cut filter, and the like. IP is an image plane, and when used as a photographing optical system of a video camera or a digital still camera, an imaging surface of an imaging element (photoelectric conversion element) such as a CCD sensor or a CMOS sensor is placed. Further, when used as a photographing optical system of a silver halide film camera, a photosensitive surface corresponding to the film surface is placed.

  Among the aberration diagrams, in the spherical aberration diagram, the solid line is d-line, and the two-dot chain line is g-line. In the astigmatism diagram, a dotted line is a meridional image plane, and a solid line is a sagittal image plane. Lateral chromatic aberration is represented by g-line. In the lateral aberration diagrams, aberration diagrams of the d line at an image height of 100%, 70%, the center, 70% on the opposite side, and 100% on the opposite side are shown in order from the top. The broken line represents a sagittal image plane, and the solid line represents a meridional image plane. Fno is an F number, and ω is a half angle of view (degree). The half angle of view ω indicates a value by ray tracing value. In the lens sectional view, the arrow indicates the movement locus of each lens group during zooming from the wide angle end to the telephoto end.

  In each of the following embodiments, the wide-angle end and the telephoto end refer to zoom positions when the variable magnification lens unit is located at both ends of the range in which the optical axis of the zoom lens can move. In each of the embodiments, two image stabilizing lens units A and B are provided to move in a direction having a component in the direction perpendicular to the optical axis for image blur correction.

  The lens configuration of the zoom lens of Embodiments 1 to 4 will be described. In the lens sectional views of FIG. 1, FIG. 5, FIG. 9, and FIG. 13, L1 is a first lens group of positive refractive power, L2 is a second lens group of negative refractive power, and L3 is a third lens of positive refractive power. A lens group, L4 is a fourth lens group of negative refractive power, and L5 is a fifth lens group of positive refractive power. The rear unit LR has a fourth lens unit L4 and a fifth lens unit L5. Arrows indicate movement loci of the respective lens units and the aperture stop SP during zooming from the wide-angle end to the telephoto end.

  During zooming, the distance between the second lens unit L2 and the third lens unit L3 is reduced so that the distance between the first lens unit L1 and the second lens unit L2 is increased at the telephoto end with respect to the wide angle end. The spacing between adjacent lens groups changes so that the spacing between the group L3 and the rear group LR is increased. In the rear unit LR, each lens unit is moved such that the distance between the fourth lens unit L4 and the fifth lens unit L5 is increased so that the distance between the third lens unit L3 and the fourth lens unit L4 is increased.

  The first lens unit L1, the third lens unit L3, and the fourth lens unit L4 are located on the object side at the telephoto end with respect to the wide angle end. During zooming from the wide-angle end to the telephoto end, the second lens unit L2 moves along a convex trajectory toward the image side, and the fifth lens unit L5 moves along a convex trajectory toward the object side. During zooming, the zoom ratio is increased while appropriately reducing the size of the entire system by moving each lens unit appropriately. In FIGS. 1 and 9, the aperture stop SP is disposed between the second lens unit L2 and the third lens unit L3, and moves along a locus independent of these lens units during zooming.

  Specifically, the distance between the second lens unit L2 and the aperture stop SP is reduced at the telephoto end with respect to the wide-angle end, and the distance between the aperture stop SP and the third lens unit L3 is reduced. There is. By doing this, the distance from the aperture stop SP to the first lens unit L1 can be shortened at the wide angle end, and the front lens effective diameter determined on the wide angle side is reduced. Further, the distance between the second lens unit L2 and the third lens unit L3 can be shortened on the telephoto side, thereby securing the moving amounts of the second lens unit L2 and the third lens unit L3 which are necessary for zooming. doing. Thus, the zoom ratio is increased while shortening the overall lens length.

  In FIGS. 5 and 13, the aperture stop SP is disposed in the third lens unit L3 (between the lenses of the third lens unit L3). By arranging the aperture stop SP in the third lens unit L3, the distance between the second lens unit L2 and the third lens unit L3 becomes short at the telephoto end, so the second lens unit L2 and the third lens necessary for zooming The moving amount with the group L3 can be secured long enough. As a result, it is easy to increase the zoom ratio while reducing the overall length of the lens.

  The aperture stop SP may be disposed on the image side of the third lens unit L3. In this case, it is difficult to miniaturize the front lens effective diameter, but the small diameter of the third lens unit L3 and the fourth lens unit L4 while securing a long moving amount between the second lens unit L2 and the third lens unit L3. Is easy to

  The lens configuration of the zoom lens of Example 5 will be described. In the lens sectional view of FIG. 17, L1 is a first lens group of positive refractive power, L2 is a second lens group of negative refractive power, L3 is a third lens group of positive refractive power, and L4 is positive refractive power Fourth lens group. The rear unit LR is composed of a fourth lens unit L4. During zooming, the distance between the second lens unit L2 and the third lens unit L3 is reduced so that the distance between the first lens unit L1 and the second lens unit L2 is increased at the telephoto end with respect to the wide angle end. Each lens group is moved such that the distance between the group L3 and the fourth lens group L4 is increased.

  Further, the first lens unit L1 and the third lens unit L3 are located on the object side at the telephoto end with respect to the wide angle end. The second lens unit L2 is a locus convex on the image side, and the fourth lens unit L4 is a locus convex on the object side.

  As described above, by appropriately moving each lens group, both downsizing and high magnification are achieved. The aperture stop SP is disposed on the object side of the third lens unit L3, and moves integrally with the third lens unit L3 during zooming. The integration mechanism simplifies the zooming movement mechanism. In each embodiment, focusing is performed by the final lens unit. The fifth lens unit L5 is moved to the object side in the first to fourth embodiments during focusing from infinity to near distance. During focusing from infinity to near distance, in the fifth embodiment, the fourth lens unit L4 is moved to the object side.

  The zoom lens of each embodiment has two anti-vibration lens groups that move so as to have a component in the direction perpendicular to the optical axis to perform blur correction (image blur correction) on the imaging surface due to camera shake or the like. There is. One is an anti-vibration lens group A which moves so as to have a component in the direction perpendicular to the optical axis.

  In FIGS. 1, 5, 9, and 17, the vibration reduction lens group A is the second lens group L2. In FIG. 13, the vibration reduction lens group A is the first lens group L1. Image blurring correction is performed by moving the vibration reduction lens unit A in a direction perpendicular to the optical axis.

  For example, in FIGS. 1 and 5, the second lens unit L2 is moved in a direction perpendicular to the optical axis to perform image blurring correction. Further, in FIGS. 9 and 17, the second lens unit L2 and the first lens unit L1 in FIG. 13 are rotated about a point on the optical axis or in the vicinity of the optical axis separated to some extent in the image side direction from each lens Shake correction is performed. In FIGS. 9, 13 and 17, it is similar to FIGS. 1 and 5 in that the anti-vibration lens group A has a movement component (shift component) in the direction perpendicular to the optical axis. A blur correction function is obtained. This point is different from FIGS. 1 and 5 in that the anti-vibration lens group A has a falling component (tilt component) due to the rotation.

  Next, the configuration at this time will be described with reference to FIG. FIG. 21 shows a mechanism in which the anti-vibration lens group Is pivots about one point Lap on the optical axis La. In the mechanism shown in the figure, the lens holder LH holding the anti-vibration lens group Is is realized by a configuration in which several spheres SB are sandwiched between the lens holder LH and the adjacent fixing member LB. The lens holder LH is configured to be movable by rolling of the spherical body SB with respect to the fixing member LB.

  If the shape of the receiving surface of the spherical body SB in contact with the fixing member LB and the lens holder LH is made spherical in such a configuration, the lens holder LH can be rotated. The spherical surfaces which are the receiving surfaces of the fixing member LB and the lens holder LH may be the same center of curvature.

  In order to maintain good optical performance at the time of image blur correction, it is necessary to correct decentration aberrations produced when the anti-vibration lens group moves in a direction having a component in the direction perpendicular to the optical axis. In FIG. 9, FIG. 13 and FIG. 17, the anti-vibration lens group A sets the tilt component so as to correct the decentering aberration caused by the shift component, thereby improving the optical performance at the time of image blur correction. When the shake correction angle is increased to correct a large image blur, the shift amount of the vibration reduction lens unit also increases, and eccentric aberration increases. Also in the rotation in FIGS. 9, 13 and 17, the eccentric aberration increases as the shift amount is large.

  Therefore, in the zoom lens of each embodiment, a lens unit other than the vibration reduction lens unit A is moved so as to have a component in a direction perpendicular to the optical axis to reduce decentration aberration. Hereinafter, a lens unit that moves in order to reduce eccentric aberration generated in the vibration reduction lens group A will be referred to as a vibration reduction lens group (correction lens group) B.

  At this time, in FIGS. 1, 9, 13 and 17, the vibration reduction lens group B is the third lens group L3. In FIG. 5, the vibration reduction lens group B is the fourth lens group L4. Eccentric aberration is intentionally generated by rotating the vibration reduction lens group B about a point on the optical axis or in the vicinity of the optical axis, and decentration aberration generated in the vibration reduction lens group A is corrected. There is. Further, by arranging the rotation center in the vicinity of the vibration reduction lens group B, a large movement component in the direction perpendicular to the optical axis, that is, a shift component does not occur.

  If a large amount of shift components are generated, a large amount of space must be secured in advance in the lens barrel so that movement in the direction perpendicular to the optical axis can be performed. If the shift component is small, it is easy to arrange an actuator for moving the vibration reduction lens group B, and it becomes easy to miniaturize the lens barrel.

  In each embodiment, the action caused by the movement of the vibration reduction lens group B places emphasis on the correction of decentration aberration so that the vibration reduction action does not occur so much. In each embodiment, decentration aberration is reduced by moving the vibration reduction lens group B together with the movement of the vibration reduction lens group A, and a good image is obtained at the time of image blur correction. In particular, even when the image blur correction angle is large, better optical performance can be obtained by the action of the anti-vibration lens group B as compared with the configuration of only the anti-vibration lens group A. Aberrations to be reduced as eccentric aberration include eccentric coma, inclination of the image plane, eccentric distortion, eccentric astigmatism, eccentric chromatic aberration, and the like.

  The rotational mechanism of the anti-vibration lens group B may be a spherical surface having a small radius of curvature, with the configuration shown in FIG. 21, for the fixed member LB and the lens holder LH with respect to the spherical body SB.

  In each embodiment, it is preferable that the vibration reduction lens group A have a certain degree of refractive power. By strengthening the refracting power, it is possible to increase the vibration reduction sensitivity and reduce the amount of shift component for a predetermined image blur correction angle. As a result, the occurrence of decentering aberration occurring in the vibration reduction lens group A is reduced. The image stabilization sensitivity is defined as the shift amount of the image point (imaging position) at the center of the screen on the image plane when the image stabilization lens group moves (shifts) in the direction perpendicular to the optical axis. It is the divided value.

Further, it is preferable that the anti-vibration lens unit A have a high anti-vibration sensitivity at the telephoto end than at the wide-angle end. In the zoom lens, the focal length of the zoom lens (entire system) at a predetermined zoom position is f, the shift amount of the anti-vibration lens group A is SA, the anti-vibration sensitivity of the anti-vibration lens group A is TA, Assuming that the shake correction angle is θA, the following equation is established.

SA = f × tan θA / TA (A)
Since the shift amount SA is proportional to the focal length f, the shift amount SA tends to be larger as the focal length is longer. On the other hand, the shift amount SA is in inverse proportion to the vibration isolation sensitivity TA. Therefore, it is preferable to reduce the shift amount SA as a configuration in which the image stabilization sensitivity TA is large at the telephoto end. In this way, it is possible to reduce the occurrence of decentration aberration due to the shift amount SA of the vibration reduction lens group A at the telephoto end. This is effective particularly when it is desired to increase the image blur correction angle on the telephoto side in a zoom lens with a high zoom ratio. Next, the following is derived from equation (A).

θA = tan ⁻¹ (SA × TA / f) (B)
Assuming that the image blur correction angle when moving the vibration reduction lens group B simultaneously with the movement of the vibration reduction lens group A is θ, the following is derived.
θA / θ = {tan ⁻¹ (SA × TA / f)} / θ (C)
Equation (C) represents the ratio of the image blur correction angle θA based on the shift amount SA of the vibration reduction lens group A to the image blur correction angle θ when the vibration reduction lens group A and the vibration reduction lens group B are simultaneously moved. When the image blur correction effect by the vibration reduction lens unit B does not occur, θA = θ.

  In each of the embodiments, since the anti-vibration effect of the anti-vibration lens unit B is not generated so much, the value of the expression (C) is made not to be largely deviated from 1. When the equation (C) is larger than 1, each image blur correction due to the movement of the anti-vibration lens group A and the anti-vibration lens group B has an opposite sign. Therefore, in order to obtain a desired image blur correction angle, it is necessary to move the anti-vibration lens group A larger. When the equation (C) is smaller than 1, each image blur correction by the movement of the anti-vibration lens group A and the anti-vibration lens group B has the same sign.

  Next, in each embodiment, it is preferable to use the anti-vibration lens unit A as a lens unit closer to the object than the aperture stop SP because the effective diameter of the front lens is reduced. At the time of image blur correction, the height at which the light beam passes in the anti-vibration lens unit A and the lens unit closer to the object side than that changes. The effective diameters of these lens units must be such that the peripheral light amount at the time of image blur correction is secured. These effective diameters increase as the image blur correction angle increases. If the antivibration lens group A is on the object side with respect to the aperture stop SP, and the lens group on the object side is as much as possible, the change in height at which the light beam passes during image blurring correction is reduced. In this way, the increase in the front lens effective diameter is reduced while increasing the image blur correction angle.

  Next, it is preferable that the vibration reduction lens unit B have a certain degree of refractive power. By strengthening the refractive power, it is easy to correct decentration aberration without increasing the rotation angle too much. If the rotation angle is too large, many decentration aberrations of high order occur.

  When the vibration reduction lens group B is a lens group closer to the image than the vibration reduction lens group A, downsizing of the vibration reduction lens group A is facilitated. Since the anti-vibration lens group B need not have the anti-vibration function, it need not be disposed on the object side like the anti-vibration lens group A. When the vibration reduction lens group B is disposed in the vicinity of the aperture stop SP, the lens diameter is reduced, so that the drive mechanism of the vibration reduction lens group B is reduced in size. Furthermore, it is preferable that the zoom lens of the present invention satisfies the following conditions.

Image blur of the anti-vibration lens group B fB, focal length of the entire system (zoom lens) at the telephoto end, ft, maximum value of the image blur correction angle at the telephoto end θt, image blur at the telephoto end The rotation angle of the vibration reduction lens unit B at the time of correction is taken as TBt. At this time,
0.01 <| fB | / ft <0.35 (1)
0.85 <| TBt | / θt <10.00 (2)
It is good to satisfy the conditional expression

  Next, technical meanings of the above-mentioned conditional expressions will be described. Conditional expression (1) defines the focal length of the vibration reduction lens unit B, that is, the refractive power. If the focal length of the anti-vibration lens unit B becomes long beyond the upper limit and the refracting power is too weak (if the absolute value of the refracting power becomes too small), the occurrence of decentration aberration generated at the time of rotation weakens. As a result, when the rotation angle is increased in order to correct the decentering aberration generated from the vibration reduction lens unit A, many decentering aberrations of high order occur. For example, high-order astigmatism and high-order eccentric distortion aberration are often generated.

  In addition, a large amount of color shift in the eccentric direction occurs due to the prism action. If the rotation angle is not increased, decentration aberrations produced by the vibration reduction lens unit A will be undercorrected. If the focal length of the anti-vibration lens group B becomes short and the refracting power becomes too strong (if the absolute value of the refractive power becomes too large) beyond the lower limit of conditional expression (1) (if the absolute value of the refractive power becomes too large) It will increase. It is preferable that the decentration aberration produced when the vibration reduction lens group B is rotated be canceled as an aberration generated in the vibration reduction lens group as a low order aberration to some extent.

  If the refractive power of the vibration reduction lens group B is increased with a small number of lenses, aberration correction as the lens group becomes insufficient, and high-order aberrations are likely to occur at decentering. If it is necessary to increase the number of constituent lenses to correct the aberration of the vibration reduction lens group B sufficiently, the size of the vibration reduction lens group B increases, which is not good.

  Conditional expression (2) defines the rotation angle of the vibration reduction lens unit B. If the rotation angle exceeds the upper limit of the conditional expression (2) and the rotation angle is too large with respect to the image blur correction angle, many decentration aberrations of high order occur. For example, high-order astigmatism and high-order eccentric distortion aberration are often generated. In addition, a large amount of color shift in the eccentric direction occurs due to the prism action. In order to reduce relatively low-order decentering aberrations generated by the vibration reduction lens unit A, it is desirable that the upper limit be not exceeded.

  If the rotation angle exceeds the lower limit of the conditional expression (2) and the rotation angle is too small with respect to the image blur correction angle, the positional accuracy at the time of driving becomes high, which is not good. The anti-vibration lens group B needs to be driven in good synchronization with the anti-vibration lens group A such that the remainder of the decentration aberration correction is within the allowable range. If the lower limit is exceeded, it is difficult to obtain good optical performance because the uncorrected residual of the decentration aberration exceeds the allowable range. More preferably, the numerical ranges of the conditional expressions (1) and (2) are set as follows.

0.03 <| fB | / ft <0.30 (1a)
0.95 <| TBt | / θt <9.00 (2a)
As described above, according to the present invention, it is possible to obtain a zoom lens having high optical performance even when the image stabilizing lens unit is small and the image blur correction angle is large.

In each embodiment, it is more preferable to satisfy one or more of the following conditional expressions. The focal length of the anti-vibration lens unit A is fA. RBt distance (on the optical axis) at the telephoto end to the most object-side lens surface or et rotational center of the vibration reduction lens group B of the vibration reduction lens group B, the most object-side lens surface or these vibration reduction lens group B whose distance on the image side of the lens Menma a (on the optical axis) and LB. The movement component of the vibration reduction lens group A in the direction perpendicular to the optical axis of the vibration reduction lens group A at the time of image blur correction at the image blur correction angle θt at the telephoto end is SAt. It is called TAt.

  The maximum value of the image blur correction angle at the wide angle end is θw, and the movement component in the direction perpendicular to the optical axis of the vibration reduction lens unit A at the time of image blur correction at the image blur correction angle θw is SAw. The vibration reduction sensitivity of the vibration lens group A is TAw, and the focal length of the entire system at the wide angle end is fw. The focal length of the first lens unit L1 is f1. The first lens group L1 has a positive lens and a negative lens, and the Abbe number of the material of the positive lens G1p having the largest Abbe number among the positive lenses included in the first lens group L1 is ν1p, and the partial dispersion ratio is It is called PgF1p. The Abbe number of the material of the negative lens G1n having the smallest Abbe number among the negative lenses included in the first lens unit L1 is ν1n, and the partial dispersion ratio is PgF1n.

The zoom lens LO has an aperture stop SP, the distance on the optical axis in the most image side lens Menma the vibration reduction lens group A from the aperture stop SP at the wide angle end to DSAW. The distance from the vertex of the image-side lens surface of the anti-vibration lens group A at the wide-angle end to the vertex of the lens surface of the anti-vibration lens group B closest to the object is DABw. Among these, it is preferable to satisfy one or more of the following conditional expressions.

0.01 <| fA | / ft <0.45 (3)
-1.00 <RBt / LB <1.00 (4)
0.7 <{tan ⁻¹ (SAt × TAt / ft)} / θt <1.4 (5)
0.7 <{tan ⁻¹ (SAw × TAw / fw)} / θw <1.4 (6)
3.00 <TAt / TAw (7)
0.20 <f1 / ft <0.50 (8)
−0.002 <(PgF1p−PgF1n) / (ν1p−ν1n) (9)
-20.00 <DSAw / fw <-2.00 (10)
2.00 <DABw / fw <20.00 (11)

  The sign of the distance RBt is positive when the center of rotation is on the image side of the vertex of the lens surface of the image stabilizing lens unit B closest to the object. The sign of the distance DSAw is positive when the vertex of the lens surface closest to the image on the anti-vibration lens group A is on the image side of the aperture stop SP. The sign of the distance DABw is positive when the vertex of the lens surface closest to the object side of the anti-vibration lens group B is on the image side of the vertex of the lens surface nearest to the image side of the anti-vibration lens group A.

  Next, technical meanings of the above-mentioned conditional expressions will be described. Conditional expression (3) defines the focal length, that is, the refractive power of the vibration reduction lens unit A. If the focal length becomes too long beyond the upper limit value, that is, if the absolute value of the refractive power becomes too small, the effect of image blurring correction due to the shift component decreases. As a result, when the shift component is increased to achieve a desired image blur correction angle, the drive mechanism becomes larger.

  If the focal length becomes too short beyond the lower limit value, that is, if the absolute value of the refractive power becomes too large, the positional accuracy at the time of driving becomes high. It is necessary to control the anti-vibration lens group A so that the image blur correction remainder falls within the allowable range. For this reason, if the lower limit is exceeded, the remaining image blur correction exceeds the allowable range, making stable image blur correction difficult.

  Conditional expression (4) defines the position of the rotation center of the anti-vibration lens unit B. When the center of rotation is at a position away from the anti-vibration lens unit B, the radius of rotation becomes large, so that a shift component is generated along with the rotation. If the upper limit or the lower limit is exceeded, the rotation radius becomes too large, and the shift component becomes large as the rotation is performed, and the drive mechanism of the vibration reduction lens group B becomes large.

  Conditional expression (5) defines the ratio of the image blur correction angle based on only the shift component of the vibration reduction lens unit A to the image blur correction angle of the entire system at the telephoto end. If the ratio of the image blur correction angle by the vibration reduction lens group A is too large beyond the upper limit value, the shift component of the vibration reduction lens group A necessary to obtain a desired image blur correction angle becomes large. In this case, the drive mechanism of the vibration reduction lens group A is enlarged. If the moving amount of the anti-vibration lens group A is too large, the lens diameter of the anti-vibration lens group A or the lens group on the object side therefrom increases to secure the peripheral light amount at the telephoto end, and the entire system becomes large.

  If the lower limit is exceeded, the image blur correction angle by the vibration reduction lens group B needs to be increased by the amount that the image blur correction angle by the vibration reduction lens group A decreases. In this case, the shift component of the vibration reduction lens group B becomes too large, and the drive mechanism of the vibration reduction lens group B becomes large.

  Conditional expression (6) defines the ratio of the image blur correction angle based on only the shift component of the vibration reduction lens unit A to the image blur correction angle of the entire system at the wide angle end. If the ratio of the image blur correction angle by the vibration reduction lens group A is too large beyond the upper limit value, the shift component of the vibration reduction lens group A necessary to obtain a desired image blur correction angle becomes large. In this case, the drive mechanism of the anti-vibration lens group A becomes large. If the moving amount of the anti-vibration lens group A is too large, the lens diameter of the anti-vibration lens group A or the lens group on the object side from this increases to secure the peripheral light amount at the wide angle end, and the entire system becomes large. .

  If the lower limit is exceeded, the image blur correction angle by the vibration reduction lens group B needs to be increased by the amount that the image blur correction angle by the vibration reduction lens group A decreases. In this case, the shift component of the vibration reduction lens group B becomes too large, and the drive mechanism of the vibration reduction lens group B becomes large.

  Condition (7) defines the ratio of the image stabilization sensitivity at the telephoto end to the image stabilization sensitivity at the wide angle end of the image stabilizing lens unit A. If the upper limit is exceeded and the ratio of the image stabilization sensitivity is too large, the image stabilization sensitivity at the telephoto end is too high, and the position accuracy at the time of driving becomes high. Although it is necessary to control the anti-vibration lens group A so that the image blur correction remainder falls within the allowable range, if the anti-vibration sensitivity is too high, stable image blur correction becomes difficult.

  If the lower limit is exceeded and the ratio of the image stabilization sensitivity is too small, the image stabilization sensitivity at the telephoto end is too low, and the shift component of the image stabilizing lens unit A increases. Therefore, the drive mechanism of the vibration reduction lens group A is increased in size. In addition, an increase in shift component causes a large decentration aberration, and even if the vibration reduction lens group B is rotated, it is difficult to correct the decentration aberration. Therefore, it becomes difficult to obtain good optical performance at the time of image stabilization.

  Conditional expression (8) defines the focal length of the first lens group, that is, the positive refractive power. If the focal length exceeds the upper limit and the focal length is too long, that is, the positive refractive power is too weak, the total lens length at the telephoto end increases, which makes it difficult to miniaturize the entire system. If the focal length is too short beyond the lower limit, that is, if the positive refractive power is too strong, a large amount of spherical aberration will occur at the telephoto end. If the number of lenses of the first lens unit L1 is increased to reduce the spherical aberration at this time, the first lens unit L1 is increased in size, the front lens effective diameter is increased, and the lens weight is increased.

  Conditional expression (9) defines the relationship between the partial dispersion ratio of the material of the positive lens forming the first lens unit L1 and the material of the negative lens. In order to reduce the secondary spectrum at the telephoto end, the partial dispersion ratio of the material of the positive lens is preferably relatively large, and the partial dispersion ratio of the material of the negative lens is preferably relatively small. Further, in order to reduce the first order achromatism and the second order spectrum without strengthening the refractive power of the negative lens, it is preferable that the equation (9) be close to zero. If the lower limit value is exceeded and the distance from zero is increased, the secondary spectrum becomes large, and the resolution due to color bleeding is reduced.

  Condition (10) defines the position of the anti-vibration lens group A with respect to the aperture stop SP. In order to reduce the front lens effective diameter, it is preferable that the anti-vibration lens unit A be disposed closer to the object than the aperture stop SP. If the anti-vibration lens unit A is too close to the aperture stop SP beyond the upper limit, the effective diameter of the front lens increases to secure the peripheral light amount at the time of anti-vibration, making it difficult to miniaturize the entire system.

  If the vibration reduction lens group A is too far from the aperture stop SP beyond the lower limit, the position at which the off-axis light flux is bent in the vibration reduction lens group A becomes high. As a result, aberration fluctuation in off-axis light beam at the time of image stabilization, for example, decentering astigmatism and image tilt occur frequently. In particular, the angle at which the off-axis light beam enters the anti-vibration lens group A is likely to be tight at the wide angle end, and these decentering aberrations fluctuate greatly.

  Conditional expression (11) defines the position of the vibration reduction lens group B with respect to the vibration reduction lens group A. In order to miniaturize the drive mechanism, the vibration reduction lens unit B is preferably disposed in the vicinity of the aperture stop SP. As a result, the anti-vibration lens group B is disposed on the image side to a certain extent relative to the anti-vibration lens group A. However, if the vibration reduction lens group B is too far from the vibration reduction lens group A beyond the upper limit, that is, as the image plane is approached, decentering astigmatism particularly easily occurs in the vibration reduction lens group B, and the image tilts and Correction of axial chromatic aberration becomes difficult.

  If the vibration reduction lens group B is too close to the vibration reduction lens group A beyond the lower limit, the lens diameter of the vibration reduction lens group B increases, making it difficult to miniaturize the entire system. In particular, at the wide angle end, the lens effective diameter tends to increase at a position close to the front lens, which is not good. More preferably, the numerical ranges of conditional expressions (3) to (11) are set as follows.

0.02 <| fA | / ft <0.40 (3a)
-0.80 <RBt / LB <0.80 (4a)
0.8 <{tan ⁻¹ (SAt × TAt / ft)} / θt <1.3 (5a)
0.75 <{tan ⁻¹ (SAw × TAw / fw)} / θw <1.35 (6a)
4.00 <TAt / TAw (7a)
0.25 <f1 / ft <0.46 (8a)
-0.0018 <(PgF1p-PgF1n) / (. Nu.1p-.nu.1n) (9a)
-15.00 <DSAw / fw <-2.50 (10a)
2.50 <DABw / fw <16.00 ・ ・ ・ (11a)

In Examples 1 and 3, the rear unit LR includes the fourth lens unit L4 of negative refractive power and the fifth lens unit L5 of positive refractive power, which are disposed in order from the object side to the image side, and zooming At the same time, the fourth lens unit L4 and the fifth lens unit L5 both move along a locus different from that of the other lens units. The vibration reduction lens group A is a second lens group L2, and the vibration reduction lens group B is a third lens group L3.

In Example 2, the rear unit LR is composed of a fourth lens unit L4 of negative refractive power and a fifth lens unit L5 of positive refractive power, which are disposed in order from the object side to the image side, and the fourth lens during zooming The group L4 and the fifth lens group L5 both move along different loci from other lens groups. The vibration reduction lens group A is a second lens group L2, and the vibration reduction lens group B is a fourth lens group L4.

In Example 4, the rear unit LR is composed of a fourth lens unit L4 of negative refractive power and a fifth lens unit L5 of positive refractive power, which are disposed in order from the object side to the image side, and the fourth lens The group L4 and the fifth lens group L5 both move along different loci from other lens groups. The vibration reduction lens group A is a first lens group L1, and the vibration reduction lens group B is a third lens group L3.

  In the fifth embodiment, the rear unit LR includes the fourth lens unit L4 having positive refractive power, and the fourth lens unit L4 moves in a convex locus toward the object during zooming from the wide-angle end to the telephoto end. . The vibration reduction lens group A is a second lens group L2, and the vibration reduction lens group B is a third lens group L3.

  Next, an embodiment of a camcorder (video camera) using the zoom lens according to the present invention as a photographing optical system will be described with reference to FIG. In FIG. 22, reference numeral 10 denotes a camera body, and 11 denotes a photographing optical system constituted by any one zoom lens described in the first to fifth embodiments. Reference numeral 12 denotes a solid-state imaging device (photoelectric conversion device) such as a CCD sensor or a CMOS sensor which is built in the camera body and receives an object image formed by the photographing optical system 11. Reference numeral 13 denotes a finder for observing a subject image formed on a solid-state image sensor 12 which is constituted by a liquid crystal display panel or the like.

  The imaging device of the present invention preferably includes any of the above-described zoom lenses and a circuit that electrically corrects distortion and / or lateral chromatic aberration. As described above, when the zoom lens is configured to allow distortion, it is easy to reduce the number of lenses of the zoom lens and to miniaturize the zoom lens. Further, by electrically correcting the magnification chromatic aberration, it becomes easy to reduce blurring of the color of the photographed image and to improve the resolution.

  Next, numerical data of each embodiment of the present invention will be shown. In each numerical data, i indicates the order of surfaces from the object side. In the numerical data, ri is the radius of curvature of the ith lens surface in order from the object side. di is the i-th lens thickness and air gap in order from the object side. ndi and νdi are the refractive index and Abbe number for the d-line of the glass of the i-th material in order from the object side.

  In the fifth embodiment, the value of the distance d12 is minus, because the aperture stop SP and the third lens unit L3 are sequentially counted from the object side to the image side. The aspheric surface shape is the X axis in the optical axis direction, the H axis in the direction perpendicular to the optical axis, the forward direction of light is positive, R is the paraxial radius of curvature, K is the conical constant, and A4, A6, A8 and A10 are the aspheric surfaces. When it is considered as a factor

It is expressed by the following formula. Also, [e + X] means [× 10 + x], and [e−X] means [× 10−x]. BF is a back focus, which is the air conversion of the distance from the lens last surface to the paraxial image plane.

  The total lens length is the distance from the foremost surface of the lens to the final surface of the lens plus the back focus BF. The aspheric surface is indicated by adding * after the surface number. In the lens group position data at the time of image shake correction, the image shake correction angle θ represents the maximum shake correction angle when the vibration reduction lens group A and the vibration reduction lens group B are simultaneously moved. Specifically, it means the angle that the chief ray of a light beam formed at a point intersecting the optical axis on the image plane makes with the optical axis on the object side with respect to the first lens unit L1. The plus sign means that the principal ray is on the object side of the first lens unit L1 above the optical axis in the lens sectional view of each embodiment. Table 1 shows the relationship between the above-mentioned conditional expressions and numerical values in numerical data.

  The shift amount SA of the anti-vibration lens group A represents the amount of movement when the anti-vibration lens group A moves only by shift. The plus sign means upward movement in the lens sectional view of each embodiment. When the anti-vibration lens group A rotates, its position is indicated by the rotation center position and the rotation angle. The rotation center position represents the distance from the vertex of the most object-side lens surface of the anti-vibration lens unit A. The plus sign means that the rotation center is located on the image side of the vertex of the most object side lens surface of the anti-vibration lens group A. The plus sign of the rotation angle of the vibration proof lens A means the counterclockwise direction in the lens sectional view of each embodiment.

  The shift component SA of the vibration reduction lens group A represents the distance from the vertex of the most object side lens surface of the vibration reduction lens group A to the optical axis in a state determined by the rotation center and the rotation angle. The plus sign means moving upward in the lens sectional view of each embodiment.

  The rotation center position RB of the anti-vibration lens group B represents the rotation center position based on the vertex of the most object-side lens surface of the anti-vibration lens group B. The plus sign means that the rotation center is located on the image side of the vertex of the most object side lens surface of the vibration reduction lens group B. The rotation angle TB of the anti-vibration lens group B means a counterclockwise direction in the lens cross-sectional view of each embodiment. The above position data of the anti-vibration lens group A and the anti-vibration lens group B correspond to the image blur correction angle θ.

Example 1
Unit mm

Surface data surface number rd nd d d
1 90.506 1.45 1.91082 35.3
2 49.691 5.25 1.49700 81.5
3-190.810 0.05
4 41.122 3.30 1.49700 81.5
5 123.186 (variable)
6 176.629 0.75 1.83481 42.7
7 8.495 5.17
8-31.845 0.60 1.77250 49.6
9 31.806 0.16
10 17.211 1.95 1.95906 17.5
11 58.494 (variable)
12 (F-stop) ∞ (Variable)
13 * 10.127 2.70 1.55332 71.7
14 * -164.352 2.05
15 28.069 0.60 1.80400 46.6
16 10.483 0.35
17 15.141 0.60 2.00100 29.1
18 10.941 2.40 1.49700 81.5
19-25.985 (variable)
20 117.589 0.70 1.48749 70.2
21 25.315 (variable)
22 25.258 2.20 1.88300 40.8
23-24.535 0.50 2.00069 25.5
24-3781.915 (variable)
25 0.8 0.80 1.51633 64.1
26 0.9 0.97
Image plane ∞

Aspheric surface data surface 13
K = -2.78122e-001 A 4 = -5.12569e-005 A 6 =-2.68879e-007
A 8 = -4.43947e-010

14th
K = -5.90735e-002 A 4 = 2.88676e-005 A 6 = -2.47428e-007
A 8 = -5.60026e-011

Various data Zoom ratio 47.49
Wide-angle Intermediate telephoto focal length 4.42 25.16 209.90
F number 3.50 5.23 6.72
Half angle of view (degrees) 41.96 8.72 1.05
Image height 3.33 3.88 3.88
Lens total length 96.70 108.91 138.21
BF 11.40 24.43 9.97

d 5 0.75 30.51 61.69
d11 36.18 10.05 1.05
d12 9.92 1.87 0.35
d19 2.85 6.81 8.69
d21 4.83 4.47 25.68
d24 9.90 22.93 8.48

Zoom lens group data group Start focal length
1 1 80.32
2 6-9.38
3 12 ∞
4 13 19.68
5 20 -66.34
6 22 32.67
7 25 ∞

PgF1p 0.5374
PgF1n 0.5824

Anti-vibration lens group A Second lens group L2
Anti-vibration lens group B Third lens group L3

Image stabilization data
Wide-angle Intermediate Telephoto blurring correction angle θ 3.999 ° 1.498 ° 0.390 ° Shift amount of anti-vibration lens group A SA -0.582mm -0.439mm -0.479mm
Anti-vibration sensitivity TA of the anti-vibration lens group A -0.4380 -1.4994 -3.8224
Rotational center position RB of anti-vibration lens group B-5.000 mm-5.000 mm-5.000 mm
Rotation angle TB of anti-vibration lens group B 0.500 ° 0.000 ° -1.667 °

Example 2
Unit mm

Surface data surface number rd nd d d
1 41.449 0.90 1.85478 24.8
2 27.348 3.48 1.49700 81.5
3-1153.447 0.05
4 27.520 2.10 1.60311 60.6
5 92.432 (variable)
6 282.227 0.45 1.83481 42.7
7 6.352 3.65
8-21.432 0.35 1.83481 42.7
9 21.296 0.05
10 13.265 1.70 1.95906 17.5
11 111.345 (variable)
12 * 7.038 2.10 1.49710 81.6
13 * 298.824 1.34
14 (F-stop) ∞ 0.76
15 7.765 0.40 1.85478 24.8
16 5.114 0.42
17 * 7.160 2.20 1.49710 81.6
18 * -79.748 (variable)
19 -26.607 0.40 1.77250 49.6
20 6.539 1.35 1.69895 30.1
21 28.760 (variable)
22 20.818 2.90 1.83481 42.7
23 -14.775 0.40 1.92286 18.9
24-38.951 (variable)
25 0.8 0.80 1.51633 64.1
26 ∞ 1.30
Image plane ∞

Aspheric surface data plane 12
K = 7.35330e-001 A 4 = -4.31802e-004 A 6 =-1.58020e-005
A8 = -7.68839e-007 A10 = -1.07274e-008

13th surface
K = 3.82706e-005 A 4 = 1.63912e-004 A 6 =-2.48920e-005
A 8 = -3.66782e-008

17th
K = -1.19620e + 000 A 4 = 1.01141e-003 A 6 = -2.75883e-005
A 8 = -8.58844e-008

18th
K = 1.61705e-004 A 4 = 5.28935e-004 A 6 =-2.64531e-005
A 8 = -8.07045e-007

Various data Zoom ratio 28.93
Wide-angle Intermediate telephoto focal length 4.58 23.87 132.52
F number 3.32 5.18 6.86
Half angle of view (degrees) 40.86 9.23 1.66
Image height 3.33 3.88 3.88
Lens total length 64.66 73.44 85.95
BF 9.08 20.63 5.97

d 5 0.54 15.72 29.29
d11 25.87 6.64 0.40
d18 1.75 2.83 6.48
d21 2.41 2.62 18.81
d24 7.25 18.81 4.14

Zoom lens group data group Start focal length
1 1 42.92
2 6-6.71
3 12 11.84
4 19-15.24
5 22 17.69
6 25 ∞

PgF1p 0.5374
PgF1n 0.6121

Anti-vibration lens group A Second lens group L2
Anti-vibration lens group B Fourth lens group L4

Image stabilization data
Wide-angle Intermediate Telephoto blurring correction angle θ 3.977 ° 1.505 ° 0.992 ° Shift amount of anti-vibration lens group A SA-0.518 mm-0.318 mm-0.494 mm
Anti-vibration sensitivity TA of the anti-vibration lens group A-0.6188-1.9671-4.6801
Rotational center position RB of anti-vibration lens group B 0.420 mm 0.420 mm 0.420 mm
Rotation angle TB of anti-vibration lens group B-0.500 degrees-0.500 degrees-2.000 degrees

[Example 3]
Unit mm

Surface data surface number rd nd d d
1 92.972 1.48 1.91082 35.3
2 51.921 5.43 1.49700 81.5
3-345.037 0.05
4 47.064 4.00 1.49700 81.5
5 216.541 (variable)
6 194.017 0.69 1.83481 42.7
7 8.114 3.89
8 -76.733 0.55 1.80400 46.6
9 75.097 1.44
10-23.437 0.55 1.83481 42.7
11 153.110 0.05
12 25.611 1.71 1.95906 17.5
13 -129.369 (variable)
14 (F-stop) ∞ (Variable)
15 * 10.177 2.68 1.55332 71.7
16 * -88.566 2.09
17 21.846 0.50 1.77250 49.6
18 9.532 0.45
19 12.727 0.50 1.80518 25.4
20 8.473 3.68 1.49700 81.5
21-23.919 (variable)
22-112.478 0.35 1.77250 49.6
23 8.698 1.34 1.68893 31.1
24 28.333 (variable)
25 20.423 2.76 1.65844 50.9
26 -20.242 0.46 1.95906 17.5
27 -37.496 (variable)
28 0.8 0.80 1.51633 64.1
29 ∞ 2.35
Image plane ∞

Aspheric surface data plane 15
K = 1.07318e-001 A 4 = -1.03711e-004 A 6 =-2.05066e-006
A 8 = -2.64723e-008

16th
K = -4.32545e + 001 A 4 = 2.17212e-005 A 6 =-2.22581e-006
A 8 = -1.36334e-008

Various data zoom ratio 61.52
Wide-angle Intermediate telephoto focal length 3.90 25.15 239.92
F number 3.51 5.36 6.82
Half angle of view (degrees) 45.01 8.79 0.92
Image height 3.18 3.88 3.88
Lens total length 97.36 125.35 148.46
BF 10.95 16.35 8.89

d 5 0.75 37.78 67.25
d13 34.02 6.13 0.62
d14 11.59 7.77 0.46
d21 2.19 8.50 16.03
d24 3.21 14.16 20.55
d27 8.08 13.48 6.02

Zoom lens group data group Start focal length
1 1 86.69
2 6-8.44
3 14 ∞
4 15 16.73
5 22 -24.30
6 25 23.65
7 28 ∞

PgF1p 0.5374
PgF1n 0.5824

Anti-vibration lens group A Second lens group L2
Anti-vibration lens group B Third lens group L3

Image stabilization data
Wide-angle intermediate telephoto image blurring correction angle θ 3.734 ° 0.859 ° 0.483 ° Rotation center position of anti-vibration lens group A 150.000 mm 150.000 mm 150.000 mm
Rotation angle of anti-vibration lens group A 0.242 degrees 0.111 degrees 0.171 degrees Shift component of anti-vibration lens group A SA -0.633 mm -0.292 mm -0.447 mm
Anti-vibration sensitivity TA of the anti-vibration lens group A-0.4307-1.5046-4.6844
Rotation center position of anti-vibration lens group B RB 4.000 mm 4.000 mm 4.000 mm
Rotation angle TB of anti-vibration lens group B 0.500 ° 0.833 ° 0.500 °

Example 4
Unit mm

Surface data surface number rd nd d d
1 41.041 0.78 1.84666 23.9
2 24.790 2.96 1.49700 81.5
3 850.388 0.13
4 26.594 2.02 1.71300 53.9
5 118.611 (variable)
6-461.569 0.42 1.88300 40.8
7 5.651 2.88
8-18.028 0.40 1.80400 46.6
9 26.838 0.10
10 11.684 1.29 1.95906 17.5
11 56.561 (variable)
12 * 8.631 1.30 1.62263 58.2
13 *-35. 578 1.10
14 (F-stop) ∞ 1.30
15 14.338 0.50 1.84666 23.9
16 6.806 0.47
17 * 51.167 1.40 1.55332 71.7
18 * -9.982 (variable)
19 -167.052 0.40 1.88300 40.8
20 26.898 (variable)
21 15. 969 2.54 1.77250 49.6
22-27.183 0.50 1.92286 18.9
23 -69.836 (variable)
24 0.8 0.80 1.51633 64.1
25 ∞ 1.30
Image plane ∞

Aspheric surface data plane 12
K = -2.92896e-001 A 4 = -3.47222e-005 A 6 = 7.02577e-005
A 8 = -1.01803e-005 A10 = 6.45194e-007

13th surface
K = -6.07185e-002 A 4 = 5.37200e-004 A 6 = 8.49972e-005
A 8 = -1.43643e-005 A10 = 9.41810e-007

17th
K = -3.18267e-001 A 4 = 7.84938e-004 A 6 = 6.99475e-005
A 8 = -2.150311e-005 A10 = 1.50759e-006

18th
K = -6.23998e + 000 A4 = -5.50992e-004 A6 = 6.72146e-005
A 8 = -1.51202e-005 A10 = 9.30629e-007

Various data zoom ratio 21.59
Wide-angle Intermediate telephoto focal length 4.57 18.24 98.62
F number 3.61 4.80 7.31
Half angle of view (degrees) 41.74 12.05 2.20
Image height 3.33 3.88 3.88
Lens total length 50.55 61.00 77.79
BF 8.53 14.77 4.44

d 5 0.70 12.31 24.44
d11 16.72 4.65 0.45
d18 1.71 5.52 10.85
d20 2.41 3.26 17.13
d23 6.71 12.95 2.61

Zoom lens group data group Start focal length
1 1 37.55
2 6-5.98
3 12 11.45
4 19-26.21
5 21 18.06
6 24 ∞

PgF1p 0.5374
PgF1n 0.6205

Anti-vibration lens group A First lens group L1
Anti-vibration lens group B Third lens group L3

Image stabilization data
Wide-angle intermediate telephoto image blurring correction angle θ 2.114 ° 1.224 ° 0.886 ° Rotation center position of anti-vibration lens group A 60.000 mm 60.000 mm 60.000 mm
Rotation angle of anti-vibration lens group A −1.252 degrees −0.939 degrees −0.626 degrees Shift component of anti-vibration lens group A SA 1.311 mm 0.983 mm 0.655 mm
Anti-vibration sensitivity TA of the anti-vibration lens group A 0.1217 0.4859 2.6266
Rotation center position of anti-vibration lens group B RB 3.000 mm 3.000 mm 3.000 mm
Rotation angle TB of anti-vibration lens group B-0.500 degrees 1.000 degrees 1.000 degrees

[Example 5]

Unit mm

Surface data surface number rd nd d d
1 39.125 0.82 2.00100 29.1
2 21.596 3.50 1.49700 81.5
3 432.621 0.05
4 22.769 2.90 1.71300 53.9
5 196.845 (variable)
6 * 266.572 0.40 1.85135 40.1
7 * 6.020 2.74
8 -16.158 0.30 1.83481 42.7
9 16.632 0.17
10 11.237 1.40 1.95906 17.5
11 107.170 (variable)
12 (F-stop) 0.20 -0.20
13 * 6.554 1.60 1.69350 53.2
14 * -14.393 0.05
15 4.380 1.40 1.51823 58.9
16 21.510 0.30 2.00100 29.1
17 3.570 (variable)
18 11.612 2.35 1.6385 4 55.4
19-30.417 0.40 1.92286 18.9
20 -113.804 (variable)
21 0.8 0.80 1.51633 64.1
22 ∞ 1.02
Image plane ∞

Aspheric surface data surface 6
K = -1.29020e + 004 A 4 = -6.61155e-005 A 6 = 8.90248e-006
A 8 = -1.99920e-007 A10 = 1.30290e-009

Seventh side
K = 4.10002e-001 A 4 =-2.96454 e-004 A 6 = 2. 15115 e-005
A8 = -5.78404e-007 A10 = 2.06787e-008

13th surface
K = 9.71537e-001 A 4 = -1.55678e-003 A 6 = -5.79050e-005
A 8 = -5.32284e-006 A10 = -1.221314e-006

14th
K = 1.90506e + 001 A 4 = 2.30086 e-004 A 6 = 1.73488e-005
A 8 = -9.87459e-006

Various data Zoom ratio 17.04
Wide-angle Intermediate telephoto focal length 4.64 14.99 78.98
F number 3.92 5.34 7.31
Half angle of view (degrees) 40.66 14.69 2.73
Image height 3.29 3.88 3.88
Lens total length 45.79 50.79 65.27
BF 3.71 10.45 4.18

d 5 0.48 9.67 21.96
d11 16.18 5.60 0.48
d17 7.24 6.89 20.48
d20 2.16 8.90 2.63

Zoom lens group data group Start focal length
1 1 34.73
2 6-5.89
3 12 10.37
4 18 18.60
5 21 ∞

PgF1p 0.5374
PgF1n 0.5994

Anti-vibration lens group A Second lens group L2
Anti-vibration lens group B Third lens group L3

Image stabilization data
Wide-angle intermediate telephoto image blurring correction angle θ 2.429 ° 1.416 ° 0.880 ° Rotation center position of anti-vibration lens group A 80.000 mm 80.000 mm 80.000 mm
Rotation angle of the anti-vibration lens group A 0.246 degrees 0.151 degrees 0.262 degrees Shift component of the anti-vibration lens group A SA-0.343 mm-0.211 mm-0.366 mm
Anti-vibration sensitivity TA of the anti-vibration lens group A-0.7074-1.6150-3.7690
Rotational center position RB of anti-vibration lens group B 0.000 mm 0.000 mm 0.000 mm
Rotation angle TB of anti-vibration lens group B 0.833 degrees -1.333 degrees 1.000 degrees

LO zoom lens LR rear group L1 first lens group L2 second lens group L3 third lens group L4 fourth lens group L5 fifth lens group

Claims (15)

A first lens group of positive refractive power, a second lens group of negative refractive power, a third lens group of positive refractive power, and one or more lens groups disposed in order from the object side to the image side The zoom lens has a group, and the distance between the first lens group and the second lens group increases during zooming from the wide-angle end to the telephoto end, and the distance between the second lens group and the third lens group narrows. In a zoom lens in which the distance between adjacent lens groups changes so that the distance between the third lens group and the rear group increases.
An anti-vibration lens unit A that moves so as to include a component in a direction perpendicular to the optical axis upon image blur correction;
It has an anti-vibration lens group B which rotates around a point on or near the optical axis along with the movement of the anti-vibration lens group A,
The focal length of the anti-vibration lens group B is fB, the focal length of the zoom lens at the telephoto end is ft, the maximum value of the image blur correction angle at the telephoto end is θt, and the image blur correction of the image blur correction angle θt at the telephoto end Assuming that the rotation angle of the vibration reduction lens unit B at the time of image formation is TBt,
0.01 <| fB | / ft <0.35
0.85 <| TBt | / θt <10.00
A zoom lens characterized by satisfying the following conditional expression. When the focal length of the anti-vibration lens unit A is fA,
0.01 <| fA | / ft <0.45
The zoom lens according to claim 1, which satisfies the following conditional expression. The distance from the vertex of the lens surface on the most object side of the vibration reduction lens group B to the rotation center of the vibration reduction lens group B is RBt, and the vertex on the most object side lens surface of the vibration reduction lens group B When the distance to the vertex of the lens surface closest to the image is LB
−1.00 <RBt / LB <1.00
The zoom lens according to claim 1 or 2, wherein the following conditional expression is satisfied. The movement component of the vibration reduction lens group A in the direction perpendicular to the optical axis of the vibration reduction lens group A at the time of image blur correction at the image blur correction angle θt at the telephoto end is SAt. When the degree is TAt,
0.7 <{tan ⁻¹ (SAt × TAt / ft)} / θt <1.4
The zoom lens according to any one of claims 1 to 3, wherein the following conditional expression is satisfied. The maximum value of the image blur correction angle at the wide angle end is θw, and the movement component in the direction perpendicular to the optical axis of the anti-vibration lens unit A at the time of image blur correction at the image blur correction angle θw is SAw at the wide angle end Assuming that the vibration reduction sensitivity of the vibration reduction lens group A is TAw, and the focal length of the zoom lens at the wide angle end is fw,
0.7 <{tan ⁻¹ (SAw × TAw / fw)} / θw <1.4
The zoom lens according to any one of claims 1 to 4, wherein the following conditional expression is satisfied. When the anti-vibration sensitivity of the anti-vibration lens group A at the telephoto end is TAt, and the anti-vibration sensitivity of the anti-vibration lens group A at the wide angle end is TAw,
3.00 <TAt / TAw
The zoom lens according to any one of claims 1 to 5, wherein the following conditional expression is satisfied. When the focal length of the first lens group is f1
0.20 <f1 / ft <0.50
The zoom lens according to any one of claims 1 to 6, wherein the following conditional expression is satisfied. The first lens group has a positive lens and a negative lens,
Among the positive lenses included in the first lens group, the Abbe number of the material of the positive lens G1p having the largest Abbe number is 11p, the partial dispersion ratio is PgF1p, and among the negative lenses included in the first lens group Assuming that the Abbe number of the material of the negative lens G1n having the smallest Abbe number of the material is 11n and the partial dispersion ratio is PgF1n
−0.002 <(PgF1p−PgF1n) / (ν1p−ν1n)
The zoom lens according to any one of claims 1 to 7, wherein the following conditional expression is satisfied. The zoom lens has an aperture stop, DSAW a distance on the optical axis in the most image side lens Menma of the vibration reduction lens group A from the aperture stop at the wide-angle end, the focal length of the zoom lens at the wide angle end When fw,
−20.00 <DSAw / fw <−2.00
The zoom lens according to any one of claims 1 to 8, satisfying the following conditional expression. The distance from the vertex of the image-side lens surface of the anti-vibration lens group A at the wide-angle end to the vertex of the lens surface of the anti-vibration lens group B closest to the object is DABw. The focal length of the zoom lens at the wide-angle end is fw And when
2.00 <DABw / fw <20.00
The zoom lens according to any one of claims 1 to 9, satisfying the following conditional expression. The rear group is composed of a fourth lens group of positive refractive power,
During zooming from the wide-angle end to the telephoto end, the fourth lens unit moves in a convex trajectory toward the object side,
The zoom lens according to any one of claims 1 to 10, wherein the vibration reduction lens group A is the second lens group, and the vibration reduction lens group B is the third lens group. The rear group is composed of a fourth lens group of negative refractive power and a fifth lens group of positive refractive power, which are disposed in order from the object side to the image side, and the fourth lens group and the fifth lens in zooming Each group moves on a different trajectory from other lens groups,
The zoom lens according to any one of claims 1 to 10, wherein the vibration reduction lens group A is the second lens group, and the vibration reduction lens group B is the third lens group. The rear group is composed of a fourth lens group of negative refractive power and a fifth lens group of positive refractive power, which are disposed in order from the object side to the image side, and the fourth lens group and the fifth lens in zooming Each group moves on a different trajectory from other lens groups,
The zoom lens according to any one of claims 1 to 10, wherein the vibration reduction lens group A is the second lens group, and the vibration reduction lens group B is the fourth lens group. The rear group is composed of a fourth lens group of negative refractive power and a fifth lens group of positive refractive power, which are disposed in order from the object side to the image side, and the fourth lens group and the fifth lens in zooming Each group moves on a different trajectory from other lens groups,
The zoom lens according to any one of claims 1 to 10, wherein the vibration reduction lens group A is the first lens group, and the vibration reduction lens group B is the third lens group.   An image pickup apparatus comprising: the zoom lens according to any one of claims 1 to 14; and an image pickup element for receiving an image formed by the zoom lens.